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Previous issue date: 2008-01-25 / Modified polyacrylamides with ≅ 0.2 mol % of N,N-dihexylacrylamide and hydrolysis degree from 0 to 25 % were synthesized by micellar copolymerization. The hydrophobic monomer was obtained by the reaction between acryloyl chloride and N,Ndihexylamine and characterized by infrared (IR) and proton nuclear magnetic resonance (1H NMR) spectroscopy. The polymer molecular structures were determined through 1H and 13C NMR spectroscopy and the polymers were studied in dilute and semi-dilute regimes by viscometry, rheometry, static light scattering and photon correlation spectroscopy, at the temperature range from 25 to 55 ?C. The data obtained by viscometry showed that the intrinsic viscosity from the hydrolyzed polymers is larger than the precursor polymers at the same ionic strength. The comparison between the charged polymers showed that the polymer with higher hydrolysis degree has a more compact
structure in formation water (AFS). The increase of temperature led to an enhanced reduced viscosity to the polymers in Milli-Q water (AMQ), although, in brine, only the
unhydrolyzed polymer had an increase in the reduced viscosity with the temperature, and the hydrolyzed derivatives had a decrease in the reduced viscosity. The static light scattering (SLS) analyses in salt solutions evidenced a decrease of weight-average molecular weight (⎯Mw) with the increase of the hydrolysis degree, due to the reduction of the thermodynamic interactions between polymer and solvent, which was evidenced by the decrease of the second virial coefficient (A2). The polymers showed more than one relaxation mode in solution, when analyzed by photon correlation spectroscopy, and these modes were attributed to isolated coils and aggregates of several sizes. The aggregation behavior depended strongly on the ionic strength, and also on the temperature, although in
a lower extension. The polymers showed large aggregates in all studied conditions, however, their solutions did not displayed a good increase in water viscosity to be used in
enhanced oil recovery (EOR) processes / Poliacrilamidas modificadas com ≅ 0,2 mol % de N,N-dihexilacrilamida e grau de hidr?lise de 0 a 25 % foram sintetizadas por copolimeriza??o micelar. O mon?mero
hidrof?bico foi obtido pela rea??o entre cloreto de acrilo?la e N,N-dihexilamina e foi caracterizado por espectroscopia no infravermelho (IV) e resson?ncia magn?tica nuclear de
pr?ton (1H RMN). As estruturas moleculares dos pol?meros foram determinadas atrav?s de espectroscopia de RMN 1H e 13C e os pol?meros foram estudados em regime dilu?do e
semidilu?do por viscosimetria, reometria, espalhamento de luz est?tico e espectroscopia de correla??o de f?tons, na faixa de temperatura de 25 a 55 ?C. Os dados obtidos por
viscosimetria mostraram que as viscosidades intr?nsecas dos pol?meros hidrolisados s?o maiores que a do pol?mero precursor na mesma for?a i?nica e a compara??o entre os pol?meros carregados mostrou que o pol?mero com maior grau de hidr?lise tem uma estrutura mais compacta em ?gua de forma??o sint?tica (AFS). A eleva??o da temperatura
induziu um aumento na viscosidade reduzida dos pol?meros em ?gua Milli-Q (AMQ). Em solu??o salina, apenas o pol?mero neutro apresentou aumento na viscosidade reduzida com
a temperatura, enquanto os derivados hidrolisados apresentaram uma diminui??o na viscosidade reduzida. A partir do espalhamento de luz est?tico (SLS), em meio salino, foi evidenciada uma diminui??o da massa molar ponderal m?dia (⎯Mw) com o aumento do grau de hidr?lise, que foi atribu?da ? redu??o das intera??es termodin?micas entre pol?mero
e solvente, o que p?de ser deduzido pela diminui??o do segundo coeficiente do virial (A2). Os pol?meros apresentaram mais de um modo de relaxa??o em solu??o, quando analisados
por espectroscopia de correla??o de f?tons, e esses modos foram atribu?dos a cadeias isoladas e a agregados de diversos tamanhos. O comportamento de agrega??o dependeu
fortemente da for?a i?nica, e tamb?m da temperatura, embora de uma forma menos pronunciada. Os pol?meros apresentaram grandes agregados em todas as condi??es
estudadas, contudo, suas solu??es n?o mostraram um bom aumento na viscosidade da ?gua para serem usados em processos de recupera??o melhorada de petr?leo (EOR)
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17681 |
| Date | 25 January 2008 |
| Creators | Maia, Ana Maria da Silva |
| Contributors | CPF:65946499734, http://lattes.cnpq.br/7711521318854102, Costa, Marta, CPF:18822851404, http://lattes.cnpq.br/7623147392470166, Oliveira, Jackson Ara?jo de, CPF:65331060587, http://lattes.cnpq.br/5058617634570704, Soldi, Valdir, CPF:29075122934, http://lattes.cnpq.br/8467580797480867, Villetti, Marcos Antonio, CPF:49242172049, http://lattes.cnpq.br/8504489050993642, Balaban, Ros?ngela de Carvalho |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Qu?mica, UFRN, BR, F?sico-Qu?mica; Qu?mica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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